package com.tanhua.sso.service;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.tanhua.sso.mapper.UserMapper;
import com.tanhua.sso.pojo.User;
import io.jsonwebtoken.ExpiredJwtException;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.rocketmq.spring.core.RocketMQTemplate;
import org.joda.time.DateTime;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.messaging.MessagingException;
import org.springframework.stereotype.Service;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Slf4j
@Service
public class UserService {

    private final RedisTemplate<String, String> redisTemplate;

    private final UserMapper userMapper;

    private final RocketMQTemplate rocketMQTemplate;

    @Value("${jwt.secret}")
    private String secret;

    @Autowired
    public UserService(RedisTemplate<String, String> redisTemplate, UserMapper userMapper, RocketMQTemplate rocketMQTemplate) {
        this.redisTemplate = redisTemplate;
        this.userMapper = userMapper;
        this.rocketMQTemplate = rocketMQTemplate;
    }

    public String login(String phone, String code) {
        String redisKey = "CHECK_CODE_" + phone;
        boolean isNew = false;

        String redisData = redisTemplate.opsForValue().get(redisKey);
        if (!StringUtils.equals(code, redisData)) {
            return null;
        }
        this.redisTemplate.delete(redisKey);

        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("mobile", phone);
        User user = this.userMapper.selectOne(queryWrapper);
        if (null == user) {
            user = new User();
            user.setMobile(phone);
            user.setPassword(DigestUtils.md5Hex("123456"));
            this.userMapper.insert(user);

            isNew = true;
        }

        Map<String, Object> claims = new HashMap<>();
        claims.put("id", user.getId());

        // 生成token
        String token = Jwts.builder() //header，可省略
                .setClaims(claims) //payload，存放数据的位置，不能放置敏感数据，如：密码等
                .signWith(SignatureAlgorithm.HS256, secret) //设置加密方法和加密盐
                .setExpiration(new DateTime().plusHours(12).toDate()) //设置过期时间，3秒后过期
                .compact();

        log.info("token===========" + token);

        try {
            //发送用户登录成功的消息
            Map<String, Object> msg = new HashMap<>();
            msg.put("id",user.getId());
            msg.put("date",System.currentTimeMillis());

            this.rocketMQTemplate.convertAndSend("tanhua-sso-login",msg);
        } catch (MessagingException e) {
            log.error("发送消息失败！",e);
        }

        return token + "|" + isNew;

    }

    public User queryUserByToken(String token) {
        try {
            // 通过token解析数据
            Map<String, Object> body = Jwts.parser()
                    .setSigningKey(secret)
                    .parseClaimsJws(token)
                    .getBody();
            //mobile=1333333333, id=2, exp=1605513392
            User user = new User();
            user.setId(Long.valueOf(body.get("id").toString()));
            //需要返回user对象中的mobile，需要查询数据库获取到mobile
            //如果每次都查询数据库，会导致性能问题。所以需要对用户的手机号进行缓存操作
            //数据缓存是，需要设置过期时间，过期时间要与token时间一致
            //如果用户修改了手机号，需要同步修改redis中的数据

            String redisKey = "TANHUA_USER_MOBILE_" + user.getId();
            if (this.redisTemplate.opsForValue().get(redisKey) != null) {
                String mobile = this.redisTemplate.opsForValue().get(redisKey);
                user.setMobile(mobile);
                log.info(mobile);
            }
            else{
                //查询数据库
                User u = this.userMapper.selectById(user.getId());
                user.setMobile(u.getMobile());

                //将手机号写入到redis中
                //在jwt中的过期时间的单位为：秒
                long timeout = Long.valueOf(body.get("exp").toString()) * 1000 - System.currentTimeMillis();
                this.redisTemplate.opsForValue().set(redisKey,u.getMobile(),timeout, TimeUnit.MILLISECONDS);
            }

            return user;

        } catch (ExpiredJwtException e) {
            log.info("token已经过期！token = " + token);
        } catch (Exception e) {
            log.error("token不合法！   token = " + token, e);
        }
        return null;
    }
}

























